FUNCTIONAL COATING BY MEANS OF RADIATE RF MAGNETRON SPUTTERING

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Coatings of cutting tips are demanded not only for their good surface properies but also for good adherence to the substrate. The former are related to high stability, high strength and etc. and the latter to bonding characteristics between film layr and substrate and etc. The WC-TiN gradient coating was conducted by rf magnetron sputtering using multi S-guns. In order to explain the gradient coating mechanism, various analyzes were carried out ; an X-ray Diffraction for an inspection of crystalline structures, an Auger Electron Spectral Analysis for an inspection of chemical compositions and a Scanning Electron Microscopy for observations for sectioned film layrs. Two mechanisms play an important role in improving the bonding characteristics. One is that sputter-deposited elements of each layr are composed of the same crystalline structure as NaCl type. Another one is a part of carbon from WC diffuses into the substrate. The deposition of a beta-WC_<1-X>, when in a stable state at high temperature, is due to a rapid cooling and removal of partial carbon.